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Brenda Ann wrote:
It's (almost) back to original circuitry now. The 50K resistor you see hanging off the chassis is connected to the cathode of the 1st. audio amp. It doesn't belong there, but the radio will not play properly without it. With it, the cathode voltage sits around 30 volts. Without it, it sits around 70 volts, and the resulting grid bias cuts the tube off so far that there's more signal at the grid than at the plate. Any suggestions?? Are you checking cathode E to ground? If so, it looks like R24 already has 35V across it. Add the 50V from R18 to ground, you have 85V to ground, not counting the E developed across R 15. The voltages given look wrong, and they don't give a reading for the cathode. I would select a cathode R to gnd that gave the correct current for good operation. Ken |
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